Westinghouse Ch. 1 & 2 Flashcards
The device designation 52Y indicates the device is a?
Circuit breaker anti-pump auxiliary.
The accepted industry standard for showing relay contacts on circuit diagrams is to show the contacts in the position they assume when the relay is…
De-Energized.
Protective relay zones of protection are overlapped to?
Avoid leaving unprotected areas.
A high speed relay is defined as a relay that has an operating time which does not exceed?
3 to 5 Cycles
Open circuits on power systems occur more frequently than short circuit faults. True or False.
False.
The circuit diagram usually gives the following three items of information about currents and voltages: location, direction, and polarity. It does not include what?
Magnitude.
In a potential transformer the voltage drop from the polarity to the non-polarity marked terminals on the primary side is substantially in phase with the voltage drop from the polarity to the non-polarity marked terminals on the secondary side. True or False.
True.
A high current arc (in excess of 100 amperes) in the air has a nearly constant drop of around _____ volts per foot.
400
The ground and the neutral point on a three phase system are by definition the same point. True or False
False.
The current flowing out at the polarity marked terminal on the secondary side of a current transformer is substantially in phase with the current flowing in at the polarity marked side or terminal on the primary. True or False?
True.
The term symmetrical components refers to a mathematical method of reducing any unbalanced three phase set of vectors into three _____ systems.
Balanced.
A well designed protective relay system should provide three basic operational characteristics. What are they?
Reliability.
Selectivity.
Speed.
